CN112751104A - Battery pack, battery system and battery pack thermal runaway control method - Google Patents
Battery pack, battery system and battery pack thermal runaway control method Download PDFInfo
- Publication number
- CN112751104A CN112751104A CN202011620238.6A CN202011620238A CN112751104A CN 112751104 A CN112751104 A CN 112751104A CN 202011620238 A CN202011620238 A CN 202011620238A CN 112751104 A CN112751104 A CN 112751104A
- Authority
- CN
- China
- Prior art keywords
- module
- circuit
- battery pack
- branch
- switch
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000000034 method Methods 0.000 title claims abstract description 19
- 238000001816 cooling Methods 0.000 claims abstract description 46
- 239000007788 liquid Substances 0.000 claims abstract description 42
- 238000007599 discharging Methods 0.000 claims description 4
- 230000000694 effects Effects 0.000 abstract description 5
- 230000006866 deterioration Effects 0.000 abstract description 4
- 230000005764 inhibitory process Effects 0.000 abstract description 3
- 238000010586 diagram Methods 0.000 description 11
- 238000001514 detection method Methods 0.000 description 4
- 238000012986 modification Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 239000000110 cooling liquid Substances 0.000 description 2
- 230000002542 deteriorative effect Effects 0.000 description 2
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 230000009931 harmful effect Effects 0.000 description 1
- 229910001416 lithium ion Inorganic materials 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
Images
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/60—Heating or cooling; Temperature control
- H01M10/61—Types of temperature control
- H01M10/613—Cooling or keeping cold
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/60—Heating or cooling; Temperature control
- H01M10/65—Means for temperature control structurally associated with the cells
- H01M10/656—Means for temperature control structurally associated with the cells characterised by the type of heat-exchange fluid
- H01M10/6567—Liquids
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Battery Mounting, Suspending (AREA)
- Secondary Cells (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The invention discloses a battery pack, a battery system and a control method for thermal runaway of the battery pack, which can utilize a circuit module for normal power supply to supply power for a liquid cooling system, thereby: on one hand, the temperature of the circuit module out of control due to heat can be reduced, the circuit module out of control due to heat is prevented from further deterioration, and the potential safety hazard of the battery pack is reduced; on the other hand, the battery pack can also discharge the circuit module with normal power supply, the charge state of the circuit module with normal power supply is reduced, the safety performance of the battery pack is improved, the thermal runaway trigger threshold can be further improved, the thermal runaway inhibition effect on the battery pack is finally improved, and the safety and the reliability of the battery pack are improved.
Description
Technical Field
The invention relates to the technical field of batteries, in particular to a battery pack, a battery system and a method for controlling thermal runaway of the battery pack.
Background
Taking a lithium ion battery as an example, one of the main sources of unsafe conditions is thermal runaway of the battery, and when a certain battery module in the battery pack is subjected to thermal runaway, if the battery module in which the thermal runaway occurs is not processed, safety accidents such as fire, explosion and the like can be caused.
Disclosure of Invention
The embodiment of the invention provides a battery pack, a battery system and a battery pack thermal runaway control method, which are used for isolating a battery module with thermal runaway when one or some battery modules in the battery pack have thermal runaway so as to improve the safety and reliability of the battery pack.
In a first aspect, an embodiment of the present invention provides a battery pack, including: the liquid cooling system comprises a plurality of circuit modules and a liquid cooling system, wherein each circuit module comprises at least one battery;
the battery pack is provided with a positive output end and a negative output end, the liquid cooling system is respectively connected with the positive output end and the negative output end, and each circuit module is arranged between the positive output end and the negative output end;
when part of the circuit modules are in thermal runaway of the batteries and the rest of the circuit modules are normal, the liquid cooling system is used for: and under the drive of the electric energy provided by the rest circuit modules, cooling each circuit module.
In a second aspect, an embodiment of the present invention provides a battery system, including: at least one battery pack as provided in the embodiments of the present invention.
In a third aspect, an embodiment of the present invention provides a method for controlling thermal runaway of a battery pack, where the battery pack is as described in the foregoing battery pack provided in the embodiment of the present invention; the control method comprises the following steps:
when it is determined that thermal runaway occurs in some of the circuit modules in the plurality of circuit modules of the battery pack and the other circuit modules are normal, the other circuit modules are controlled to provide electric energy for the liquid cooling system, so that the liquid cooling system cools each circuit module.
The technical effects that can be realized by the technical scheme are as follows:
the battery pack, the battery system and the control method for thermal runaway of the battery pack, which are provided by the embodiment of the invention, can utilize the circuit module for normal power supply to supply power for the liquid cooling system, so that: on one hand, the temperature of the circuit module out of control due to heat can be reduced, the circuit module out of control due to heat is prevented from further deterioration, and the potential safety hazard of the battery pack is reduced; on the other hand, the battery pack can also discharge the circuit module with normal power supply, the charge state of the circuit module with normal power supply is reduced, the safety performance of the battery pack is improved, the thermal runaway trigger threshold can be further improved, the thermal runaway inhibition effect on the battery pack is finally improved, and the safety and the reliability of the battery pack are improved.
Drawings
Fig. 1 is a schematic structural diagram of a battery pack according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of another battery pack provided in the embodiment of the present invention;
fig. 3 is a schematic structural diagram of another battery pack provided in the embodiment of the present invention;
fig. 4 is a schematic structural diagram of another battery pack provided in an embodiment of the present invention;
fig. 5 is a schematic structural diagram of another battery pack provided in an embodiment of the present invention;
fig. 6 is a schematic structural diagram of another battery pack provided in an embodiment of the present invention;
fig. 7 is a schematic structural diagram of another battery pack provided in an embodiment of the present invention;
fig. 8 is a schematic structural diagram of another battery pack provided in an embodiment of the present invention;
fig. 9 is a schematic structural diagram of another battery pack provided in an embodiment of the present invention;
fig. 10 is a schematic structural diagram of another battery pack provided in an embodiment of the present invention;
fig. 11 is a schematic structural diagram of a battery system according to an embodiment of the present invention;
fig. 12 is a flowchart of a method for controlling thermal runaway of a battery pack according to an embodiment of the present invention.
Detailed Description
Specific embodiments of a battery pack, a battery system, and a method for controlling thermal runaway of the battery pack according to embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It should be noted that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
An embodiment of the present invention provides a battery pack, as shown in fig. 1 to 3, which may include: a plurality of circuit modules (e.g., D1, D2, D3, and D4) and a liquid cooling system 10, the circuit modules (e.g., D1, D2, D3, and D4) including at least one battery (e.g., C1 to C7);
the battery pack is provided with a positive output end and a negative output end, the liquid cooling system 10 is respectively connected with the positive output end and the negative output end, and each circuit module is arranged between the positive output end and the negative output end;
when thermal runaway occurs in the batteries in part of the circuit modules and other circuit modules are normal, the liquid cooling system 10 is used for: and under the drive of the electric energy provided by the other circuit modules, cooling each circuit module.
As shown in fig. 1, two circuit modules are shown, labeled D1 and D2, respectively, circuit module D1 includes two batteries (labeled C1 and C2, respectively), and circuit module D2 includes one battery (labeled C3); alternatively, as shown in fig. 2 and 3, three circuit modules are shown, and for example, as shown in fig. 2, the three circuit modules are respectively labeled as D1, D2 and D3, the circuit module D1 includes two batteries (respectively labeled as C1 and C2), the circuit module D2 includes one battery (labeled as C3), and the circuit module D3 includes three batteries (respectively labeled as C4, C5 and C6).
Also, the plurality of circuit modules mentioned in the above description may be understood as at least two circuit modules, that is, the number of circuit modules included in the battery pack may be: two (as shown in fig. 1), three (as shown in fig. 2 and 3), four (not shown), etc., which may be set according to actual needs, and are not limited herein; also, the number of batteries included in each circuit module may be: 1, two or 3, etc., which can be set according to practical needs, and are not limited herein.
In addition, taking fig. 1 as an example, when thermal runaway occurs in the battery C2 in the circuit module D1 and the circuit module D2 does not have thermal runaway and can normally supply power, the liquid cooling system 10 may be powered by the circuit module D2, so that the liquid cooling system 10 may perform cooling processing on each circuit module in the battery pack under the driving of the electric power provided by the circuit module D2.
So, can utilize the circuit module of normal power supply to supply power for the liquid cooling system to: on one hand, the temperature of the circuit module out of control due to heat can be reduced, the circuit module out of control due to heat is prevented from further deterioration, and the potential safety hazard of the battery pack is reduced; on the other hand, the battery pack can also discharge the circuit module with normal power supply, the charge state of the circuit module with normal power supply is reduced, the safety performance of the battery pack is improved, the thermal runaway trigger threshold can be further improved, the thermal runaway inhibition effect on the battery pack is finally improved, and the safety and the reliability of the battery pack are improved.
To illustrate a point, optionally, in an embodiment of the present invention, for a liquid cooling system:
when each circuit module has no thermal runaway and can normally work, the liquid cooling system can carry out cooling treatment on each circuit module under the driving of the electric energy provided by each circuit module.
And, optionally, in the embodiment of the present invention, each circuit module is disposed between the positive output terminal and the negative output terminal, which can be understood as:
if all the circuit modules are regarded as a whole, one end of the whole is electrically connected with the positive output end, and the other end of the whole is electrically connected with the negative output end.
Optionally, in the embodiment of the present invention, as shown in fig. 1 to fig. 3, the circuit module (taking D1 as an example) includes: a module branch M1 and a switch branch Z1;
the module branch M1 includes at least one battery module (not shown), which includes at least one battery (e.g., C1 and C2);
switching branch Z1 is used for: when the thermal runaway of the battery module in the corresponding module branch M1 occurs, the corresponding module branch M1 is isolated, so that the circuit module D1 stops discharging.
So, through setting up the switch branch road for when thermal runaway appeared in the battery module that corresponds in the module branch road, the switch branch road can keep apart and correspond the module branch road, avoids appearing the battery module that thermal runaway in the corresponding module branch road and continues to discharge, and then avoids appearing the module branch road further aggravation of thermal runaway, avoids causing harmful effects to the module branch road of normal work simultaneously, realizes the protection to the battery package, thereby improves the security and the reliability of battery package.
Specifically, in the embodiment of the present invention, the connection relationship between the circuit modules includes: at least one of a series connection and a parallel connection.
That is, the circuit modules may be connected to each other in the following manner:
mode 1:
the circuit modules are connected in series as shown in fig. 1 and 2.
The method comprises the following steps:
the circuit modules are connected in parallel, and are not shown in the figure.
Mode 3:
after being connected in series, part of the circuit modules are connected in parallel with the rest of the circuit modules, and the illustration is not shown; or, after being connected in parallel, some circuit modules are connected in series with the rest circuit modules, as shown in fig. 3.
Therefore, the connection relation among the circuit modules can be set according to actual needs to meet the needs of different application scenes and improve the flexibility of design.
Of course, in practical cases, the series-parallel arrangement mode between the circuit modules is not limited to that shown in fig. 1 to 3, and may be arranged in other forms according to actual needs, and is not limited herein.
Specifically, in the embodiment of the present invention, for the circuit modules connected in series: the switch branch and the corresponding module branch are arranged in parallel, and the module branch comprises a circuit breaking structure.
Wherein, when having battery thermal runaway in certain module branch road (the hypothesis is module branch road Mi), the switch branch road that corresponds (the hypothesis is switch branch road Zi) switches on, and module branch road Mi is through the disconnection structure disconnect-connection that opens circuit, and then can make normal circuit module supply power through this switch branch road Zi, in other words, when switch branch road Zi switches on, the structure that opens circuit in the corresponding module branch road Mi is used for: and a loop is not formed between the module branch and the corresponding switch branch, so that the normal circuit module can supply power through the switch branch.
For parallel connected circuit modules: the switch branch is connected in series with the corresponding module branch.
When the switch branch and the corresponding module branch are connected in series, the module branch may not include the open circuit structure, or may include the open circuit structure, but is not limited thereto.
For example, taking the example of fig. 1, two circuit blocks, labeled D1 and D2, are shown and connected in series, where:
the module branch M1 and the switch branch Z1 in the circuit module D1 are connected in parallel;
the module branch M2 and the switch branch Z2 in the circuit module D2 are also connected in parallel;
if thermal runaway occurs in the module branch M1 in the circuit module D1, the switch branch Z1 in the circuit module D1 may be in a closed state, the module branch M1 connected in parallel is shorted, and meanwhile, the circuit breaking structure L1 in the module branch M1 is disconnected, so that while the purpose of isolating the corresponding module branch M1 is achieved, a loop may be prevented from being formed between the switch branch Z1 and the module branch M1, and on the basis of preventing the module branch M1 from further deteriorating, power is only supplied to the outside through the circuit module D2 (i.e., to the liquid cooling system 10), and the circuit module D1 stops supplying power to the outside.
That is, when the switch branch is connected in parallel with the corresponding module branch, if the switch branch is in the closed state, the circuit breaking structure may be in the open state, and if the switch branch is in the open state, the circuit breaking structure may be in the closed state.
For another example, as shown in fig. 3, three circuit blocks are shown, which may also be labeled as D1, D2, and D4, respectively, wherein the circuit block D1 and the circuit block D4 are connected in parallel and then connected in series with the circuit block D2, and at this time:
the module branch M1 and the switch branch Z1 in the circuit module D1 are connected in series;
the module branch M4 and the switch branch Z4 in the circuit module D4 are also connected in series;
if the module branch M4 in the circuit module D4 is out of thermal control, the switch branch Z4 in the circuit module D4 may be in an open state, and the switch branch Z1 in the circuit module D1 may be in a closed state, so as to achieve the purpose of isolating the corresponding module branch M4, so that power is supplied to the outside (i.e., to the liquid cooling system 10) only through the circuit module D1 and the circuit module D2, and the circuit module D4 stops supplying power to the outside.
So, through switch branch road and the setting that corresponds the relation of connection between the module branch road under the different situation, can keep apart when thermal runaway appears in the module branch road that the switch branch road corresponds, correspond the module branch road, avoid corresponding the module branch road further to worsen to improve the security and the reliability of battery package.
It should be noted that, in the embodiment of the present invention, the reason why the disconnection structure is provided is that:
when the switch branch and the corresponding module branch are arranged in parallel, if the module branch is not provided with a circuit breaking structure, when the battery module in a certain module branch is out of thermal control and the corresponding switch branch is in a closed state, a loop can be formed between the switch branch and the corresponding module branch, and at the moment, if the loop is not disconnected, the battery module in the module branch can be further deteriorated, so that more serious results can be caused;
if the module branches are internally provided with the circuit breaking structure, when the battery module in a certain module branch is out of thermal runaway and the corresponding switch branch is in a closed state, the circuit breaking structure can control the switch branch and the corresponding module branch not to form a loop, and at the moment, the module branch out of thermal runaway can be isolated, so that the module branch can be prevented from further deteriorating, and further serious consequences can be avoided, and the reliability and safety of the battery pack can be improved;
meanwhile, for the module branch which normally works, the corresponding switch branch is in an open state, so that the circuit breaking structure in the module branch which normally works can be in a closed state, and the module branch which normally works supplies power to the outside through the switch branch corresponding to the module branch out of thermal control.
Specifically, in the embodiment of the present invention, the disconnection structure may include: at least one of a switch, a fuse, and a fuse.
Wherein, to fuse or fuse, suppose that form the return circuit between module branch road and the corresponding switch branch road, because of the electric current in this return circuit is great, can be so that fuse or fuse break, and then make the module branch road and correspond the circuit disconnection between the switch branch road, can keep apart this module branch road, avoid the module branch road further to worsen.
Of course, in practical cases, the circuit breaking structure is not limited to the switch, the fuse and the fuse, and other structures may be adopted to implement the function of the circuit breaking structure, which may be selected according to practical needs, and is not limited herein.
Specifically, in the embodiment of the present invention, as shown in fig. 1 to 3, the switching legs include switches.
That is to say, the switch branch is a branch provided with a switch, and the switch branch can be controlled to be in a closed state or an open state through the switch, so that the function of the switch branch is realized.
Specifically, in an embodiment of the present invention, the switch may include: at least one of a relay, a contactor, and a circuit breaker.
Specifically, in the embodiment of the present invention, the number of switches included in each switch branch may be set in the following manner:
mode 1:
alternatively, the number of switches included in each switching leg may be set to 1, as shown in fig. 1 to 3.
Mode 2:
alternatively, the number of switches included in each switch branch may be set to be plural.
For example, as shown in fig. 4, taking the battery pack including three circuit modules (labeled as D1, D2, and D3, respectively) as an example, at this time:
the switching branch in circuit module D1 includes switches: a switch k1 and a switch k 4;
the switching branch in circuit module D2 includes switches: a switch k2 and a switch k 5;
the switching branch in circuit module D3 includes switches: a switch k3 and a switch k 4;
some of the switches are switches shared by two circuit modules, such as: the switch k4 is shared by the circuit block D1 and the circuit block D3.
That is, in this manner 2, as shown in fig. 4, assuming that thermal runaway occurs in the circuit module D3, the switch k3 and the switch k4 may be closed, and the switch k1, the switch k2 and the switch k5, and the breaking structure L3 may be opened; alternatively, switch k4 and switch k5 may be closed, and switch k1, switch k2 and switch k3, and breaking structure L3 may be opened; or, the switch k3, the switch k4 and the switch k5 may be all closed, and the switch k1, the switch k2 and the breaking structure L3 may be opened, so that the control mode is flexible.
In addition, when k3 fails, the related circuit module can be isolated by controlling k5 to be closed or opened and matched with other switches, or when k5 fails, the related circuit module can be closed or opened and matched with other switches by controlling k3, and the safety is high.
For example, as shown in fig. 5, taking the case where the battery pack includes three circuit modules (labeled D1, D2, and D3, respectively), at this time:
the switching branch in circuit module D1 includes switches: a switch k1 and a switch k 4;
the switching branch in circuit module D2 includes switches: a switch k2 and a switch k 3;
the switching branch in circuit module D3 includes switches: a switch k3 and a switch k 4;
some of the switches are switches shared by two circuit modules, such as: the switch k4 is shared by the circuit module D1 and the circuit module D3; the switch k3 is shared by the circuit module D2 and the circuit module D3, and has simple structure and low cost.
As shown in fig. 5, when thermal runaway of the circuit module D3 occurs, the switch k3 and the switch k4 may be closed, and the switch k1, the switch k2, and the breaking structure L3 may be opened.
Of course, in actual cases, when setting the switches in each switching branch, in addition to the above-mentioned mode 1 and mode 2, other modes may be adopted as long as the corresponding module branch that is thermally runaway can be isolated by the switches, and the specific number of switches to be set is not limited herein.
Optionally, in an embodiment of the present invention, the battery pack further includes a main switch;
the main switch is arranged in: the circuit module which is arranged closest to the positive output end in each circuit module is arranged between the positive output end and the circuit module which is arranged closest to the negative output end in each circuit module, and/or the circuit module which is arranged closest to the negative output end in each circuit module is arranged between the negative output end and the circuit module which is arranged closest to the negative output end in each circuit module;
the main switch is used for: the circuit modules are disconnected when the external power supply of each circuit module is stopped, and the circuit modules are closed when at least part of the circuit modules are powered externally.
That is, the number of the main switches k0 may be 1, and this main switch k0 may be disposed between the circuit block (D2 shown in fig. 6) disposed closest to the positive output terminal among the circuit blocks and the positive output terminal, as shown in fig. 6; or, the output voltage is set between the circuit block closest to the negative output terminal among the circuit blocks and the negative output terminal, and the illustration is not given.
Alternatively, the number of main switches (e.g., k0 and k0 ') may be 2, as shown in fig. 7, where one main switch k0 is disposed between the circuit module (e.g., D2 shown in fig. 7) disposed closest to the positive output terminal and the positive output terminal among the circuit modules, and the other main switch k 0' is disposed between the circuit module (e.g., D1 shown in fig. 7) disposed closest to the negative output terminal among the circuit modules and the negative output terminal.
Thus, through the arrangement of the main switch, when power supply of each circuit module (whether the circuit module works normally or the circuit module out of thermal runaway) is not needed, the main switch can be disconnected, so that a power supply loop is cut off; when at least part of the circuit modules (namely the circuit modules which normally work) are required to supply power, the main switch can be closed, so that a power supply loop is formed.
To illustrate, alternatively, the positive output terminal and the negative output terminal may be electrically connected to a device other than the battery pack or a structure in the battery pack that requires electric power to drive in addition to the liquid cooling system, and thus, detailed description thereof is omitted.
Alternatively, in the embodiment of the present invention, when two main switches are provided, the setting position of the main switch may be as shown in fig. 8 in addition to fig. 7, specifically:
one of the main switches k0 is disposed in the circuit module D2 closest to the positive output terminal among the circuit modules, and the other main switch k 0' is disposed in the circuit module D1 closest to the negative output terminal among the circuit modules;
at this time, for the main switch k0, the roles may be:
when the module branch M2 in the circuit module D2 operates normally and the module branch M1 in the circuit module D1 is thermally runaway: if the switch k1 and the main switch k0 are both closed and the switch k2 is open, the circuit module D2 can supply power to the liquid cooling system to form a power supply loop (as shown by a dotted line in fig. 8); if the main switch k0 is opened, even if the switch k1 is closed, the circuit module D2 will still stop providing power to the liquid cooling system;
similarly, for the main switch k 0', the function may be:
when the module branch M1 in the circuit module D1 operates normally and the module branch M2 in the circuit module D2 is thermally runaway: if the switch k2 and the main switch k 0' are both closed and k1 is open, the circuit module D1 may supply power to the liquid cooling system to form a power supply loop (not shown in fig. 8); if the main switch k 0' is open, the circuit module D1 will still stop providing power to the liquid cooling system even if the switch k2 is closed.
Moreover, when the main switch is disposed at the position shown in fig. 8, and the module branches and the corresponding switch branches are disposed in parallel, the module branches (e.g., M1 and M2) disposed near the positive output end and the negative output end may not have a circuit breaking structure, and the remaining module branches (e.g., M5) may need to have a circuit breaking structure L5, as shown in fig. 9, at this time, the main switch may be reused as a circuit breaking structure in a part of the module branches, and the specific process may be as follows:
as shown in fig. 9, if the main switch k 0' is also closed, a loop may be formed between the module branch M1 and the switch branch Z1, assuming that when the thermal runaway of the module branch M1 in the circuit module D1 occurs, the switch k1 in the corresponding switch branch Z1 is closed; if the main switch k 0' is turned off, a loop cannot be formed between the module branch M1 and the switch branch Z1;
therefore, the main switch not only can realize the function of the circuit breaking structure, but also can control whether the circuit module supplies power outwards, and meanwhile, the structure of the battery pack can be simplified, and the manufacturing difficulty of the battery pack is reduced.
Of course, in the embodiment of the present invention, the setting position of the main switch may be adjusted according to actual needs, as long as power can be supplied to the outside through the main switch control circuit module, which is not limited herein.
Specifically, in the embodiment of the present invention, the main switch may include at least one of a relay, a contactor, and a circuit breaker.
Wherein, the types of the switch and the main switch mentioned in the above can be set to be the same, such as a relay, a contactor or a breaker; alternatively, the types of switches and main switches may be set differently, such as but not limited to: the switch is set as a relay, and the main switch is set as a contactor.
Of course, in practical cases, the types of the switch and the main switch may not be limited to the above-mentioned relay, contactor, and circuit breaker, and may also be other structures that can implement the switching function and the main switching function, and are not limited herein.
Optionally, in an embodiment of the present invention, as shown in fig. 10, the battery pack further includes: a control module 30 and a detection module 20;
the detection module 20 is electrically connected to the module branches in the circuit modules and the control module 30, and is configured to: detecting whether a module branch in a circuit module has thermal runaway or not, and sending an indication signal carrying a mark of the thermal runaway circuit module to the control module 30 when the thermal runaway circuit module is detected;
the control module 30 is also electrically connected to each switch leg for: and controlling a switch branch in the thermal runaway circuit module according to the indication signal so that the switch branch isolates the corresponding module branch.
So, can confirm which or which circuit module appears thermal runaway in the battery package through detection module, and then can control the switch branch road in the circuit module that thermal runaway appears through control module to the realization is kept apart the processing to the circuit module that thermal runaway appears, avoids the circuit module that thermal runaway to appear further worsening, thereby improves the security and the reliability of battery package.
Specifically, in the embodiment of the present invention, as shown in fig. 10, the control module 30 may further be electrically connected to a main switch (e.g. k0 in fig. 10) for: controlling the main switch to be closed so as to control whether the circuit module supplies power outwards;
also, as shown in fig. 10, when the circuit breaking structure in the module branch is a switch, the control module 30 may be electrically connected to the circuit breaking structures (e.g., L1 and L2) in the module branch for: and controlling the disconnection of a circuit breaking structure in the module branch in the thermal runaway circuit module according to the indication signal so that a loop cannot be formed between the thermal runaway module branch and the corresponding switch branch.
Specifically, in the embodiment of the present invention, the control module may be, but is not limited to: a processor or other structure having processing functions, and the detection module may be, but is not limited to, a sensor.
Optionally, in the embodiment of the present invention, the battery pack includes, in addition to the circuit modules, a frame for accommodating the circuit modules, where the frame may include: the liquid cooling system can control liquid cooling liquid to flow in the liquid cooling runner so as to cool and cool each circuit module through the liquid cooling liquid.
Of course, the battery pack may include other structures for implementing the functions of the battery pack besides the circuit module and the frame body, which are described in detail in the prior art and will not be described in detail herein.
Optionally, in the embodiment of the present invention, the battery module may further include, in addition to the battery: the battery module comprises a bus bar and a wiring harness plate, wherein the bus bar can be used for realizing electric connection among batteries in the battery module, and the wiring harness plate can be used for fixing the bus bar.
Of course, the battery module may include other structures for implementing the functions of the battery module besides the battery, the bus bar and the wiring harness plate, which are described in detail in the prior art and will not be described in detail herein.
Based on the same inventive concept, an embodiment of the present invention provides a battery system, as shown in fig. 11, which may include: at least one battery pack 100 as described above according to an embodiment of the present invention.
Although fig. 11 shows 4 battery packs 100, in an actual situation, the number of battery packs included in the battery system is not limited to 4, and may be other values, and the setting needs to be performed according to the actual situation, and the description is given only by taking fig. 11 as an example.
It should be noted that, optionally, in the embodiment of the present invention, when the battery system includes a plurality of battery packs, all the battery packs may also be divided into a plurality of battery pack modules, and each battery pack module includes at least one battery pack;
and, each of the battery pack modules may include: for the battery pack branch circuit with thermal runaway, the corresponding switch branch circuit can isolate the battery pack branch circuit, and further isolate the battery pack module with thermal runaway, so as to avoid further deterioration of the battery pack module with thermal runaway, and further improve the safety and reliability of the battery system.
In addition, optionally, when the battery system has a total positive output end and a total negative output end, a main switch may be disposed between the total positive output end and the battery pack module that is closest to the total positive output end among the battery pack modules, and/or between the total negative output end and the battery pack module that is closest to the total negative output end among the battery pack modules (where a specific implementation of the main switch may refer to the foregoing specific embodiment of the main switch), and when the battery system stops providing the electric energy to the outside, the main switch may be turned off to cut off the power supply loop, thereby implementing effective and flexible control on the battery system.
Based on the same inventive concept, the embodiment of the invention provides a method for controlling thermal runaway of a battery pack, wherein the battery pack is the battery pack provided by the embodiment of the invention; as shown in fig. 12, the control method includes:
s1201, determining whether partial circuit modules exist in the plurality of circuit modules of the battery pack and thermal runaway occurs, and enabling the rest circuit modules to be normal; if yes, go to S1202; if not, executing S1203;
s1202, controlling the other circuit modules to provide electric energy for the liquid cooling system so that the liquid cooling system can cool each circuit module;
s1203, when all the circuit modules in the plurality of circuit modules of the battery pack are judged to work normally, all the circuit modules are controlled to provide electric energy for the liquid cooling system, so that the liquid cooling system can cool all the circuit modules; or when the thermal runaway of all the circuit modules in the plurality of circuit modules of the battery pack is judged, controlling all the circuit modules to stop providing electric energy for the liquid cooling system.
Optionally, in an embodiment of the present invention, the circuit module includes: during module branch road and switch branch road, still include:
when the circuit module with thermal runaway is determined to exist in the circuit modules, the switch branch circuits in the circuit module with thermal runaway are controlled to isolate the corresponding module branch circuits, so that the circuit modules stop discharging.
Optionally, in an embodiment of the present invention, the method further includes:
and when the liquid cooling system cools each circuit module, controlling the battery pack to stop supplying power to the outside.
To explain this point, when the battery pack is controlled to stop supplying power to the outside, the outside refers to a device disposed outside the battery pack, that is: when the liquid cooling system cools each circuit module, the battery pack only supplies power to the internal liquid cooling system, and does not supply power to the equipment outside the battery pack.
Therefore, adverse effects on external equipment (namely equipment arranged outside the battery pack) caused by some accidental conditions of the battery pack can be avoided, the battery pack and the external equipment can be further effectively protected, greater loss is avoided, and the safety and reliability of the battery pack are effectively improved.
Optionally, in the embodiment of the present invention, if the battery pack has at least two battery packs, and the circuit module in a part of the battery packs is in thermal runaway:
for a battery pack with thermal runaway, the battery pack can be treated by adopting the embodiment;
for a battery pack which normally works, the working condition of the battery pack can be kept, so that the battery pack can continuously work; or, the battery pack can be processed by adopting the thermal runaway processing mode; the specific setting can be carried out according to actual needs, and is not limited herein.
For example, taking two battery packs as an example, the two battery packs are respectively defined as a battery pack 1 and a battery pack 2, wherein the circuit module in the battery pack 1 is in thermal runaway, and each circuit module in the battery pack 2 is in normal operation, and at this time:
for the battery pack 1, the thermal runaway treatment mode can be adopted for treatment;
for the battery pack 2, the battery pack 2 may be kept operating normally and supplied with power, or the battery pack 2 may be controlled to stop supplying power.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (10)
1. A battery pack, comprising: the liquid cooling system comprises a plurality of circuit modules and a liquid cooling system, wherein each circuit module comprises at least one battery;
the battery pack is provided with a positive output end and a negative output end, the liquid cooling system is respectively connected with the positive output end and the negative output end, and each circuit module is arranged between the positive output end and the negative output end;
when part of the circuit modules are in thermal runaway of the batteries and the rest of the circuit modules are normal, the liquid cooling system is used for: and under the drive of the electric energy provided by the rest circuit modules, cooling each circuit module.
2. The battery pack of claim 1, wherein the circuit module comprises: a module branch and a switch branch;
the module branch comprises at least one battery module, and the battery module comprises at least one battery;
the switching branch is used for: and when the battery module corresponding to the module branch circuit is out of thermal runaway, isolating the corresponding module branch circuit to enable the circuit module to stop discharging.
3. The battery pack according to claim 2, wherein the connection relationship between the circuit modules includes: at least one of a series connection and a parallel connection.
4. The battery pack of claim 3, wherein for the circuit modules connected in series: the switch branch circuit is connected with the corresponding module branch circuit in parallel, and the module branch circuit comprises a circuit breaking structure;
for the circuit modules connected in parallel: the switch branch is connected in series with the corresponding module branch.
5. The battery pack of claim 2, wherein the switching leg comprises a switch.
6. The battery pack of claim 1, wherein the battery pack further comprises a main switch;
the main switch is arranged in: the circuit module which is arranged closest to the positive output end in each circuit module is arranged between the positive output end and the circuit module, and/or the circuit module which is arranged closest to the negative output end in each circuit module is arranged between the negative output end and the circuit module;
the main switch is used for: the circuit modules are disconnected when the external power supply is stopped, and are closed when at least part of the circuit modules supply the external power.
7. A battery system, comprising: at least one battery pack according to any one of claims 1-6.
8. A method for controlling thermal runaway in a battery pack, wherein the battery pack is as set forth in any one of claims 1 to 6; the control method comprises the following steps:
when it is determined that thermal runaway occurs in some of the circuit modules in the plurality of circuit modules of the battery pack and the other circuit modules are normal, the other circuit modules are controlled to provide electric energy for the liquid cooling system, so that the liquid cooling system cools each circuit module.
9. The control method of claim 8, wherein the circuit module comprises: during module branch road and switch branch road, still include:
and when determining that a circuit module with thermal runaway exists in the plurality of circuit modules, controlling the switch branch in the circuit module with thermal runaway to isolate the corresponding module branch so as to stop discharging the circuit module.
10. The control method according to claim 8, further comprising:
and when the liquid cooling system carries out cooling treatment on each circuit module, controlling the battery pack to stop supplying power to the outside.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011620238.6A CN112751104A (en) | 2020-12-31 | 2020-12-31 | Battery pack, battery system and battery pack thermal runaway control method |
| CN202110529344.1A CN113161647A (en) | 2020-12-31 | 2021-05-14 | Battery pack, battery system and battery pack thermal runaway control method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011620238.6A CN112751104A (en) | 2020-12-31 | 2020-12-31 | Battery pack, battery system and battery pack thermal runaway control method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112751104A true CN112751104A (en) | 2021-05-04 |
Family
ID=75650301
Family Applications (2)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011620238.6A Pending CN112751104A (en) | 2020-12-31 | 2020-12-31 | Battery pack, battery system and battery pack thermal runaway control method |
| CN202110529344.1A Pending CN113161647A (en) | 2020-12-31 | 2021-05-14 | Battery pack, battery system and battery pack thermal runaway control method |
Family Applications After (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110529344.1A Pending CN113161647A (en) | 2020-12-31 | 2021-05-14 | Battery pack, battery system and battery pack thermal runaway control method |
Country Status (1)
| Country | Link |
|---|---|
| CN (2) | CN112751104A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113285140A (en) * | 2021-05-14 | 2021-08-20 | 中航锂电（洛阳）有限公司 | Power supply system, control method and control device of power supply system |
| WO2022142829A1 (en) * | 2020-12-31 | 2022-07-07 | 宁德时代新能源科技股份有限公司 | Thermal runaway treatment method, apparatus and system, and storage medium |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115534760A (en) * | 2022-11-24 | 2022-12-30 | 河北赛勒能源科技有限公司 | Control method and device of electric automobile, vehicle control terminal and storage medium |
| WO2024164208A1 (en) * | 2023-02-09 | 2024-08-15 | 宁德时代(上海)智能科技有限公司 | Power supply and distribution system for vehicle and vehicle |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102624058A (en) * | 2012-03-29 | 2012-08-01 | 中国科学院上海微系统与信息技术研究所 | Battery management system and method with faulty battery isolation |
| CN102969756B (en) * | 2012-11-06 | 2015-06-03 | 中国科学院苏州纳米技术与纳米仿生研究所 | Intelligent battery pack with self-checking function and its connection circuit |
| CN203800141U (en) * | 2014-04-25 | 2014-08-27 | 中航锂电（洛阳）有限公司 | Power battery system with thermal runaway protection function |
| CN106696729A (en) * | 2016-11-29 | 2017-05-24 | 北京长城华冠汽车科技股份有限公司 | Battery case-separating continuous driving system of electric automobile and electric automobile |
| CN109450008A (en) * | 2018-09-26 | 2019-03-08 | 同济大学 | A kind of circuit reducing the extension harm of batteries in parallel connection group thermal runaway |
| CN110676530A (en) * | 2019-09-16 | 2020-01-10 | 常州工学院 | Thermal runaway system for series battery packs |
| CN111430840A (en) * | 2020-03-31 | 2020-07-17 | 蜂巢能源科技有限公司 | Control method and control system for delaying thermal diffusion of power battery pack |
-
2020
- 2020-12-31 CN CN202011620238.6A patent/CN112751104A/en active Pending
-
2021
- 2021-05-14 CN CN202110529344.1A patent/CN113161647A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2022142829A1 (en) * | 2020-12-31 | 2022-07-07 | 宁德时代新能源科技股份有限公司 | Thermal runaway treatment method, apparatus and system, and storage medium |
| US12294067B2 (en) | 2020-12-31 | 2025-05-06 | Contemporary Amperex Technology (Hong Kong) Limited | Method, apparatus and system for thermal runaway processing and storage medium |
| CN113285140A (en) * | 2021-05-14 | 2021-08-20 | 中航锂电（洛阳）有限公司 | Power supply system, control method and control device of power supply system |
| US11784362B2 (en) | 2021-05-14 | 2023-10-10 | Calb Co., Ltd. | Power supply system, control method of power supply system and control device of power supply system |
Also Published As
| Publication number | Publication date |
|---|---|
| CN113161647A (en) | 2021-07-23 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN112751104A (en) | Battery pack, battery system and battery pack thermal runaway control method | |
| US11967842B2 (en) | Smart battery disconnect and protection architecture for airborne high-power modular multi-string battery pack | |
| US11677232B2 (en) | Quick battery disconnect system for high current circuits | |
| US10464507B2 (en) | Battery management system and switching method thereof | |
| EP4199188B1 (en) | Self-heating control circuit and system | |
| US8593111B2 (en) | Assembled battery system | |
| US9130383B2 (en) | Charging/discharging control device, battery pack, electrical equipment, and charging/discharging control method | |
| CN105612082B (en) | Method and device for the voltage-controlled automatic disconnection of an electronic component or a battery cell | |
| US20110291481A1 (en) | Power source apparatus with fuse-implemented over-current cut-off | |
| WO2015174398A1 (en) | Battery pack, battery system, and discharging method | |
| US9831691B2 (en) | Power storage system and cell protection method which protects the cell by both cutting from the cell pack and the cell pack from the system | |
| JP2007299696A (en) | Secondary battery device | |
| EP3745555B1 (en) | Charging and discharging circuit | |
| JP2000133318A (en) | Battery pack | |
| US9472941B2 (en) | Battery module | |
| US11285841B2 (en) | Multi-voltage battery device and onboard electrical system for a motor vehicle | |
| EP3349327B1 (en) | Battery management device | |
| US9682670B2 (en) | Method for transferring batteries to a discharged state, battery management system, inverter, system for generating an AC voltage, charging current source and motor vehicle | |
| JP6848075B2 (en) | Storage battery device | |
| US20200139818A1 (en) | Power supply circuit protection device | |
| KR20150096230A (en) | Apparatus and method for preventing battery using protective circuit | |
| JP2015173568A (en) | Battery protection circuit and battery pack | |
| JP7412055B2 (en) | Charging control circuit | |
| WO2014049892A1 (en) | Electricity storage system and control device | |
| US20240162734A1 (en) | An electric battery junction arrangement and an electrical system |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20210504 |
|
| WD01 | Invention patent application deemed withdrawn after publication |